As the record holder for best box office performance in Japan and #1 Foreign-language film in the U.S., Mugen Train is a fantastic canon movie that sets itself as the pinnacle of what an anime movie of a series should be.
Demon Slayer: Kimetsu no Yaiba
Demon Slayer is an intense shonen that proves that the genre can stay relevant. With stellar animation, music, and pacing, it lives up to its hype. Most episodes will give you full-body goosebumps, make you cry, or both.